As Ajax applications, the mail clients we tested can preload information and update their displays on the fly. So when you open up an e-mail message, you'll see it immediately, rather than having to wait for it to download. And when you delete a message, the application can update instantly, even though the delete request is still being processed in the background.Read on over here.
Webmail gets more power
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PC World has posted an article on the next-generation of webmail clients from Microsoft, %Yahoo and an opensource newcomer called Zimbra. All three applications use a popular programming technique called Ajax, which uses JavaScript and XML.